Obs. : 2015-01-24 Planet Ly alpha (photons/cm^2/sec) Mercury 3.915e+11 Venus 3.880e+11 Earth 3.538e+11 Mars 3.835e+11 Jupiter 3.495e+11 Saturn 3.630e+11 Uranus 3.755e+11 Neptune 3.835e+11 Pluto 3.827e+11